Improvement in tubular boilers



G. T. SNYDER. Tubular Boilers.

No. 212,062. 'Patente d Febil, I879.

GOO O00 000 ATTORNEYS.

NPEIERS. PHOTD-UTHOGRAPHER. WASHINGTON, D. C.

UNITED STATES PATENT OFFICE.

GEORGE T. SNYDER, OF NATRONA, PENNSYLVANIA.

IMPROVEMENT IN TUBULAR BOILERS.

Specification forming part of Letters Patent N 0. 212,062, datedFebruary 4, 1879 application filed May 22, 1878.

To all whom it may concern:

Be it known that I, GEORGE T. SNYDER, of Natrona, in the county ofAllegheny and State of Pennsylvania, have invented new and usefulImprovements in Tubular Boilers, of which the following is aspecification:

The invention will first be described in connection with the drawings,and then pointed out in the claim.

In carrying out my invention, I construct the furnace and fire-box withdouble walls, braced by bolts extending from the outer to the innerplates, the space between said plates constituting a jacket and waterchamber. The boiler is cylindrical in form, provided with horizontallines, and is arranged in the fire-box directly over the grate-bars. Thelength and Width of the furnace and fire-box exceed the dimensions ofthe boiler, and the arrangement of the boiler is such that the productsof combustion from the fire-box pass under the boiler to the rear end,and return through the flues to the front end, and thence to thesmoke-stack.

The boiler and the water-jacket communicate with each other by means oftubes or water-legs, and the upper portion of said jacket is providedwith pipes leading to the steamdome or to the steam-space in the boiler.

The accompanying drawings illustrate the manner of carrying out myinvention.

Figure l is a longitudinal vertical section of an apparatus embodying myimprovements, and Fig. 2 is a transverse vertical section of the same.

Similar letters of reference indicate correspondin g parts.

The furnace and fire box A are of rectangular form at its sides, bottom,and ends, and its top is inclined upward, and vanishes into the upperportion of the horizontal cylindrical boiler B, which is arrangeddirectly over the fire-grate a. The lower portion of the furnaceconstitutes the fire-box, and is provided with doors a at the front end.

A casing, B (which may be a continuation of the boiler-casing,) extendsbeyond the front end of the furnace, above the doors a and constitutes asmoke-chamber, and it may be provided with a door, 6 From this chamberrises the smoke-stack 0. As the tubes or lines (I extend entirelythrough the boiler, and as the chamber B extends beyond the front end ofthe furnace, and the rear end of the boiler does not reach the rear wallof the furnace, the result is, that the products of combustion passunder the entire length of the boiler to the rear end thereof, andthence return through the dues d to the front end, and through thesmoke-chamber to the smokest-ack.

On the top of the boiler rests the dome E, which may be of any suitabledescription. It is here shown as of cylindrical form, connect ing withthe steam-space of the boiler by means of tubes e c.

The rear end and two sides of the furnace and fire-box are provided withdouble walls, consisting of exterior and interior plates, connected andbraced by bolts f. The space between these plates forms a jacket orwaterchamber, G, extending around three sides of a rectangle. Thiswater-jacket G communicates with the water-space of the boiler B bymeans of tubes or water-legs h, by which means a constant circulation ofwater is maintained. The top of the Water-jacket may be provided withpipes, as shown in dotted lines, communicating with the steam-dome orthe steamspace of the boiler, so that any steam which may be generatedin the jacket will pass to the dome or the boiler.

Among other advantages resulting from the construction above described,I avoid the ordinary crown-sheet, and the troublesome work of connectingthe fire-box and tubular section, and also the complicated fasteningsbetween the fire-box and cylinders.

I economize space by constructing the apparatus in a compact form, and Iobtain a large extent of heating-surface, and thereby econo mize fuel.

By omitting the complicated features referred to I lessen the cost ofconstruction.

The water jacket or chamber G not only 00 operates with the boiler inheating water for the generation of steam, but it serves as a proteetion to the boiler and a preventive of con densation when theapparatus is exposed in cold weather.

Having thus described my invention, what, ter is produced, and alsopipes for connecting I claim as new, and desire to secure by Letthe topof the water-leg with the steam-space ters Patent, isof the boiler, forthe better liberation of the The combination with a steam-boiler, of thesteam, substantially as described.

surrounding water-leg or casing Gr, provided GEORGE T. SNYDER. withpipes h, connected to the bottom of boiler lVitnesses:

and to the lower part of said water-leg at an JULIUS G. GNERRY,

angle, whereby a better circulation of the wa CHRIST. GONROY.

